Pressure maintaining device for injection molding mold

The invention discloses an injection molding mold pressure maintaining device, and relates to the technical field of injection molds, the injection molding mold pressure maintaining device comprises an injection mold, an injection molding sealing assembly is arranged behind the injection mold, a push rod is arranged in a buffer pipe, an auxiliary push block is arranged behind the push rod, and a piston is arranged on the front side of the push rod; liquid needing injection molding is injected into the injection molding channel through the buffer pipe by the injection molding guide-in port, the liquid is injected into the injection molding mold through the piston by pushing the auxiliary push block and utilizing the push rod, and the pressure discharge piston is driven by the pressure discharge operating rod to move forwards, so that pressure in the injection molding mold is relieved through the pressure discharge channel. The sealing ring is arranged between the pressure discharging channel and the pressure d